Howtosignalprocessing
Harmonics are the result of nonlinear loads that convert AC line voltage to DC. Harmonics flow into the electrical system because of nonlinear electronic switching devices, such as variable frequency drives (VFDs), computer power supplies and energy-efficient lighting.
- What can cause harmonic interference?
- How are harmonics created?
- What is harmonic frequency?
- What causes 5th and 7th harmonics?
What can cause harmonic interference?
What Causes Harmonics? Harmonics are created by electronic equipment with nonlinear loads drawing in current in abrupt short pulses. The short pulses cause distorted current waveforms, which in turn cause harmonic currents to flow back into other parts of the power system.
How are harmonics created?
In an electric power system, a harmonic of a voltage or current waveform is a sinusoidal wave whose frequency is an integer multiple of the fundamental frequency. Harmonic frequencies are produced by the action of non-linear loads such as rectifiers, discharge lighting, or saturated electric machines.
What is harmonic frequency?
A harmonic is a wave or signal whose frequency is an integral (whole number) multiple of the frequency of the same reference signal or wave. As part of the harmonic series, the term can also refer to the ratio of the frequency of such a signal or wave to the frequency of the reference signal or wave.
What causes 5th and 7th harmonics?
Magnetic cores, such as transformer and rotating machines that require third harmonic current to excite the iron. Synchronous machines (winding pitch produces fifth and seventh harmonics)
